CVE-2021-21284

In Docker before versions 9.03.15, 20.10.3 there is a vulnerability involving the –userns-remap option in which access to remapped root allows privilege escalation to real root. When using "–userns-remap", if the root user in the remapped namespace has access to the host filesystem they can modify files under "/var/lib/docker/" that cause writing files with extended privileges. Versions 20.10.3 and 19.03.15 contain patches that prevent privilege escalation from remapped user.

Date published : 2021-02-02

https://security.netapp.com/advisory/ntap-20210226-0005/

https://github.com/moby/moby/security/advisories/GHSA-7452-xqpj-6rpc